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ELEGTRQTYPE AND STEREOTYPE CASTING MOLD. N0. 296,278.

(No Model.)

Patented Apr. 1, 1884.

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(No Model.) 2 Sheets-Sheet 2.

' G. B. COTTRELL.

BLBGTROTYPE AND STIIIREOTYPB CASTING MOLD.

ND. 296,278. Patented API. l, 1884.

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Nrrnn STATES artnr ENCE@ CALI/TERT B. COTTRELL, OF'STONINGTON, CONNECTICUT.

ELEC'E'ROTYP AND STEREOTYPE CAST|NG=MOLD.

SPECIFICATION forming part of Letters Patent No. 296,278, dated April l, 188e.

Application filed March 15, 1883. (No model.)

To all whom t may concern.'

Be it known that I, GALvnRT B- Cor'rnnLL, of Stonington, in the county of- New London and State of Connecticut, have invented a new 5 and useful Improvement in Electrotype and Stereotype Casting-Molds, of which the following is a specificati on.

Prior to my invention it was extremely difi5 adapt itself to the are of a circle, as the shell or matrixqwould bend at the angles formed at the edges of the broadfaced type or cuts, while the type or cuts themselves would be dat and straight, and consequently there would be corresponding flat spaces in the plate, which would have to be pounded or hammered up before an impression could be taken. This method of perfecting the plate is an extremely diiicult one, and it is seldom that a satisfactory plate can be obtained thereby.

The object of my invention is to obtain a plate which, in so far as its printing-surface is concerned, will require no further manipulation after having been removed from the mold', and this object I accomplish by the method and apparatus hereinafter' described.

In the accompanying drawings, Figure l is s a front elevation of my improved casting-mold with a portion of the cover removed; and Fig. 2 is a plan view of the same, partly in section. Fig. 3 is a perspective view of the two upper rings of the cover.

In the drawings like letters of reference indicate like parts.

Supported on or cast with a base-plate, A, is an upright curved wall, B, having at its top onehalf of a iiaring mouth-piece, C. 'Ihe concave or inner surfaces, of this wall B conforms to the arc to which it is desired to bend the shell or matrix, said shell or matrix being heldin position by clamping-strips ff', which in turn are fastened to the mold by bolts, as g g. These clampingstrips f f are of the same thickness which it is desired to give the 5o plate, and they consequently serve to keep that portion of the mold which I call the 4 cover77 at a proper distance from the concave surface s of the other section of the mold, The cover of my mold consists of a series of semicircular rings, as a, b, c, d, die., and of a top ring, D, which is cast in such form that when in position it will complete the mouth-piece C. Each of these semicircular rings is provided with two pins, as e e', which bear against the clamping-strips f f, thereby securing a perfect register for the rings. Through the several sections of the cover there are drilled numerous radial holes, as z' if, adapted to receive pins, as 7c 7c, which may be inserted therein at pleasure, and caused to bear against the shell or matrix at points where it is desired to perfect the curve.

In practice, my mold is used in the following-described manner: The shell or matrix is placed against and bent so as to conform to the general curve of the surface s, and vis held in such position by the clampingstrips f f. The lower section of the cover is then placed in position and the curve of that portion of the shell or matrix opposite thereto perfected, in which position it is held by pins inserted through the apertures formed in said section, such apertures as are not used for the pins being filled up with clay or other suitable material. This operation is repeated with each section of the cover until the curve of the shell has been perfected throughout, and all ofthe sections are in position. The several sections of the cover are held in place by any suitable device-such as the clampingscrews s-which are shown in the drawings. IVhen the parts are in position to receive the molten metal which is to constitute the backing of the shell, or the plate proper in case of a stereotype, it is poured into the mouth-piece C. After the plate is removed from the mold, the holes formed by the pins are lled with solder.

The invention described is an improvement upon that set forth in my application, No. 79,446, filed December 16, 1882, and I donot intend to claim, broadly, herein a perforated cover, as that feature constitutes the basis of the application referred to.

I do not claim herein, broadly, the improve ment in the method of backing curved elec- IOO trotype plates which consists in perfecting Athe form of the shell and holding the same in position by pins inserted through perforations in the lid during theintroduction of the molten metal, as such method forms the subject-matter of the first claim of my application, No.

79,446, led December 16, 1882.

What I do claim as my invention herein, and desire to secure by Letters Patent, is-

l. A mold for casting electrotype or stereotype plates, in Which the cover is made up or composed of sections Which are provided with perforations adapted to receive pins, substantially as described, and for the purpose specied. 15

2. Theherein-described improvementinthe art of casting electrotype or stereotype plates, which consists in perfecting the curve of the shell or matrix, section by section, and holding such perfected portions in position until 2o after the introduction of the molten metal, substantially as described.

CALVERT B. COTTRELL. Witnesses:

H. D. DONNELLY, Gno. W. PERKINS. 

